Dry mouth — xerostomia — is a condition that pharmacy teams encounter daily but rarely address proactively. It affects an estimated 10–30% of older adults, is a side effect of over 500 commonly prescribed medicines, and has consequences that go well beyond discomfort: dental decay, oral infections, difficulty swallowing, impaired taste, and reduced quality of life. Community pharmacists are ideally placed to identify it, manage it, and refer when necessary.

Why it matters more than patients think

Saliva is not just moisture. It contains antimicrobial proteins (lysozyme, lactoferrin, immunoglobulins), bicarbonate buffers that neutralise acid, and minerals that remineralise tooth enamel. When saliva flow is reduced, the oral environment changes rapidly:

• Dental caries accelerate. Without salivary buffering and remineralisation, tooth decay progresses faster — particularly root caries in older adults.
• Oral candidiasis risk increases. Saliva's antifungal properties are reduced, making thrush more likely.
• Swallowing becomes difficult. Patients may avoid dry foods, alter their diet, or choke on tablets.
• Denture fit worsens. Saliva acts as a lubricant and adhesive for dentures; dry mouth causes sore spots and poor retention.
• Speech is affected. The tongue sticks to the palate and cheeks, making conversation effortful.

Many patients accept dry mouth as "just getting older" and do not mention it. A brief screening question during medication reviews — "Do you ever notice your mouth feels dry?" — can uncover a problem that is both common and treatable.

The most common causes

Medications (the leading cause)

According to NICE CKS, medication is the most common cause of dry mouth. The most frequently implicated drug classes include:

Patients taking multiple medications from this list (polypharmacy is the norm in older adults) have a cumulative anticholinergic burden that makes dry mouth increasingly likely. The pharmacy team can calculate the anticholinergic burden using validated scales and flag high-risk patients to prescribers.

Other causes

• Sjögren's syndrome — autoimmune destruction of salivary and lacrimal glands. Suspect in patients with concurrent dry eyes, fatigue, and joint pain.
• Radiotherapy to the head and neck — can permanently damage salivary glands.
• Diabetes — both type 1 and type 2 can cause dry mouth, particularly when blood glucose is poorly controlled.
• Dehydration — simple and reversible but easily overlooked in older adults.
• Mouth breathing — often secondary to nasal obstruction.
• Anxiety and stress — the sympathetic nervous system reduces salivary flow.

Pharmacy management

Step 1: Identify and address the cause

If a medication is the likely culprit, the pharmacist should:

• Note the medication(s) and discuss with the prescriber whether a dose reduction, timing change, or switch to an alternative with less anticholinergic activity is possible
• Not recommend stopping medications without prescriber agreement
• Advise the patient that symptomatic management can help while the cause is addressed

Step 2: Saliva substitutes and stimulants

The BNF lists several products for dry mouth management:

Saliva substitutes (artificial saliva):

Saliva stimulants:

• Sugar-free chewing gum — the simplest and most accessible stimulant. Mechanical chewing stimulates salivary flow. Must be sugar-free to protect teeth.
• Sugar-free sweets or lozenges — similar stimulant effect.
• Pilocarpine (Salagen) — a cholinergic agonist that stimulates salivary glands. Prescription-only; reserved for patients with Sjögren's syndrome or post-radiotherapy dry mouth when other measures are insufficient. Side effects include sweating, urinary frequency, and visual disturbance.

Step 3: Oral hygiene advice

Dry mouth patients are at high caries risk. Pharmacy teams should recommend:

• High-fluoride toothpaste (2,800 ppm or 5,000 ppm — prescription items in the UK) for patients with active or high-risk decay
• Regular dental check-ups — at least twice yearly, more frequently if caries-prone
• Avoid sugar-containing medicines where possible — liquid formulations are often high in sucrose
• Avoid alcohol-containing mouthwashes — alcohol exacerbates dry mouth. Recommend alcohol-free alternatives
• Sip water frequently throughout the day — this does not replace saliva's protective functions but helps with comfort and swallowing

Step 4: Practical tips for patients

• Keep water by the bed. Dry mouth is often worst at night when salivary flow naturally drops.
• Humidify the bedroom. A bowl of water near a radiator or a simple humidifier can reduce overnight dryness.
• Avoid caffeine and alcohol. Both are mild diuretics and can worsen mouth dryness.
• Use a lip balm. Dry lips often accompany dry mouth; a petroleum-based or lanolin-based lip balm prevents cracking.
• Moisten food. Sauces, gravies, and broths make swallowing easier. Avoid very dry or crumbly foods.

When to refer

Routine GP referral:

• Dry mouth with concurrent dry eyes and joint pain (possible Sjögren's syndrome)
• Dry mouth with unexplained weight loss, polyuria, or polydipsia (possible undiagnosed diabetes)
• Dry mouth that persists despite symptomatic management and medication review
• Oral candidiasis secondary to dry mouth that does not respond to OTC treatment

Dental referral:

• Any patient with chronic dry mouth should be encouraged to see a dentist for a caries risk assessment
• Patients on high-risk medications (tricyclics, antimuscarinics) who have not had a dental check in over 12 months

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Key points

• Dry mouth is a side effect of over 500 medicines and affects up to 30% of older adults
• It accelerates dental decay, increases thrush risk, and impairs swallowing and speech
• Medication review is the first step — consider alternatives with lower anticholinergic burden
• Saliva substitutes (pH-neutral products for patients with teeth) and sugar-free gum are first-line symptomatic treatments
• Refer for suspected Sjögren's syndrome, uncontrolled diabetes, or persistent symptoms despite management

Sources: NICE CKS (Dry mouth), BNF (Dry mouth), NHS (Dry mouth). Article reflects guidance current as of April 2026.